Gym members warm up on treadmills at Downsize Fitness in Addison, Texas. Membership at the gym is limited to people who have a high body mass index. LM Otero/AP hide caption itoggle caption LM Otero/AP Shots - Health News Overweight And Healthy: A Combo That Looks Too Good To Be True December 3, 2013 The proposition that some extra weight may not be a health worry has sparked a heated medical debate. Some studies have found that a little extra fat might have benefits. A new analysis suggests that for almost all people excess weight increases the risk of death and disease.